Hi!
But are you sure haven’t you changed the code? The plugin has a lot of WPMU functions that were deprecated and therefore, it should not work with WP3 multisite…. at least, It’s not working on any of my test installs.

Same problem here.
I tried to install the plugin as is, it passed the install – but the posts were not getting copied.
I simply assumed that the plugin does not support WP3 Multisite – but I’m seeing people who report using it :/